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LibWeb: Calculate selection based on glyph centers

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Previously you had to drag all the way to the end of a glyph to select
it; now you just need to drag past the center.  Also fixes #2959.
This commit is contained in:
Rewi Haar 2020-08-26 11:31:11 +12:00 • committed by Andreas Kling
parent dd83f6a266
commit 521e730df1
2 changed files with 10 additions and 7 deletions
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11
Libraries/LibWeb/Layout/LineBoxFragment.cpp
View file

@ -91,11 +91,11 @@ int LineBoxFragment::text_index_at(float x) const
float width_so_far = 0; float width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) { for (auto it = view.begin(); it != view.end(); ++it) {
float glyph_width = font.glyph_or_emoji_width(*it); float glyph_width = font.glyph_or_emoji_width(*it);
if ((width_so_far + glyph_width + glyph_spacing) > relative_x) if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
return m_start + view.byte_offset_of(it); return m_start + view.byte_offset_of(it);
width_so_far += glyph_width + glyph_spacing; width_so_far += glyph_width + glyph_spacing;
} }
return m_start + m_length - 1; return m_start + m_length;
} }
Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
@ -116,6 +116,9 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
const auto end_index = m_start + m_length; const auto end_index = m_start + m_length;
auto text = this->text(); auto text = this->text();
if (selection.start().index_in_node == selection.end().index_in_node)
return {};
if (layout_node().selection_state() == LayoutNode::SelectionState::StartAndEnd) { if (layout_node().selection_state() == LayoutNode::SelectionState::StartAndEnd) {
// we are in the start/end node (both the same) // we are in the start/end node (both the same)
if (start_index > selection.end().index_in_node) if (start_index > selection.end().index_in_node)
@ -124,7 +127,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
return {}; return {};
auto selection_start_in_this_fragment = max(0, selection.start().index_in_node - m_start); auto selection_start_in_this_fragment = max(0, selection.start().index_in_node - m_start);
auto selection_end_in_this_fragment = min(m_length, selection.end().index_in_node - m_start + 1); auto selection_end_in_this_fragment = min(m_length, selection.end().index_in_node - m_start);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment)); auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1; auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
@ -156,7 +159,7 @@ Gfx::FloatRect LineBoxFragment::selection_rect(const Gfx::Font& font) const
return {}; return {};
auto selection_start_in_this_fragment = 0; auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(selection.end().index_in_node + 1, m_length); auto selection_end_in_this_fragment = min(selection.end().index_in_node, m_length);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment)); auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1; auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;

6
Libraries/LibWeb/Page/Frame.cpp
View file

@ -26,12 +26,12 @@
#include <LibWeb/DOM/Document.h> #include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLAnchorElement.h> #include <LibWeb/HTML/HTMLAnchorElement.h>
#include <LibWeb/InProcessWebView.h>
#include <LibWeb/Layout/LayoutBreak.h> #include <LibWeb/Layout/LayoutBreak.h>
#include <LibWeb/Layout/LayoutDocument.h> #include <LibWeb/Layout/LayoutDocument.h>
#include <LibWeb/Layout/LayoutText.h> #include <LibWeb/Layout/LayoutText.h>
#include <LibWeb/Layout/LayoutWidget.h> #include <LibWeb/Layout/LayoutWidget.h>
#include <LibWeb/Page/Frame.h> #include <LibWeb/Page/Frame.h>
#include <LibWeb/InProcessWebView.h>
namespace Web { namespace Web {
@ -221,7 +221,7 @@ String Frame::selected_text() const
if (selection.start().layout_node == selection.end().layout_node) { if (selection.start().layout_node == selection.end().layout_node) {
if (!is<LayoutText>(*selection.start().layout_node)) if (!is<LayoutText>(*selection.start().layout_node))
return ""; return "";
return downcast<LayoutText>(*selection.start().layout_node).text_for_rendering().substring(selection.start().index_in_node, selection.end().index_in_node - selection.start().index_in_node + 1); return downcast<LayoutText>(*selection.start().layout_node).text_for_rendering().substring(selection.start().index_in_node, selection.end().index_in_node - selection.start().index_in_node);
} }
// Start node // Start node
@ -246,7 +246,7 @@ String Frame::selected_text() const
ASSERT(layout_node == selection.end().layout_node); ASSERT(layout_node == selection.end().layout_node);
if (is<LayoutText>(*layout_node)) { if (is<LayoutText>(*layout_node)) {
auto& text = downcast<LayoutText>(*layout_node).text_for_rendering(); auto& text = downcast<LayoutText>(*layout_node).text_for_rendering();
builder.append(text.substring(0, selection.end().index_in_node + 1)); builder.append(text.substring(0, selection.end().index_in_node));
} }
return builder.to_string(); return builder.to_string();